#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;


class Solution {
public:
    void rezolvare (string fileInput, string fileOutput){
        ifstream fileIn; fileIn.open(fileInput, ios::in);
        ofstream fileOut; fileOut.open(fileOutput, ios::out);

        // From here we start the problem.
        fileIn >> number;
        
        for (int i = 1; i <= number; i++) {
            for (int q = 1; q <= number; q++) {
                if (find(fractii.begin(), fractii.end(), (double)i/q) == fractii.end()) {
                    fractii.push_back((float)i/q);
                    countFractii++;
                }
            }
        }

        fileOut << countFractii;
        fileIn.close(); fileOut.close();
    }

private:
    int number{0};
    vector<double> fractii;
    int countFractii = 0;
};

int main()
{
    Solution s;
    s.rezolvare("fractii.in", "fractii.out");
    return 0;
}